The Sentinel Initiative uses which data sources to monitor safety in real time?

• A. Data from randomized controlled trials only
• B. Public health surveillance reports only
• C. Large existing electronic health databases (e.g., electronic health records, insurance claims databases)
• D. Pharmacy purchase data only

Answer: (C)

Real-time safety monitoring relies on rich, longitudinal health data that show both exposure and outcomes across large, diverse populations. The Sentinel Initiative achieves this by using large existing electronic health databases, such as electronic health records and insurance claims databases. These sources continuously capture who received a product, when, and what health events followed, across many care settings. This breadth and depth allow near real-time signal detection, assessment of event rates over time, and comparison of outcomes while adjusting for patient characteristics. In contrast, randomized controlled trials are typically narrower in scope and not designed for post-market, real-time surveillance. Public health surveillance reports, while valuable, are often episodic and slower to accumulate. Pharmacy purchase data track dispensing but don’t reliably show whether adverse events occurred or the health outcomes that matter for safety signals.